Self-tightening bushing-tool holder and tools.



No. 878,776. PATENTED FEB. 11, 1908.

. B. S. COSTA.

SELF TIGHTBNING BUSHING TOOL HOLDER AND TOOLS.

APPLICATION FILED NOV. 1/1907.

wW/Waia'aa' I I Hwavfln 1.1 %0% 6ZA0 Z A My? 7 Z %1 f6. 0%WM. atbavw/ayrUNITED STATES-PATENT OFFICE.

ENOS S. COSTA, OF QUINCY, MASSACIEI 'USETTS.

SELF-TIGHTENING BUSHING-TOOL HOLDER AND TOOLS.

Specification of Letters Patent.

Patented Feb. 11, 1908.

A nea-m filed November 1, 1907. Serial No. 400,305.

To all whom it may concern:

Be it known that I, Enos S. Ocean, at citizen of the United States,residing at Quincy, county of Norfolk, State of Massachusetts,

have invented. a certain new and useful IniprovedSelflTighteningBushing-Tool Holder and Tools, of which the following is a s ecifi'-cation,'reference being had therein to the accompanying drawings.

The invention 'is especially intended for application to tools in 'whichtwo or more work-tools are employed in one holder and especially totools which are used in work on granite, marble or lI'OIl work or thelike, whether they are power driven tools or hand tools, such forinstance as surfacer bush-' ceive the shanks of the tools, the socketrecess having walls on all four sides. The holder of the constructionshown in that patent is rather expensive of construction.

One object of the present invention is to provide a holder whichshall beless expen-e sive of construction than the one shown in that patent andwhich is adapted for quick and easy insertion of the work-tools andwhich shall also hold them firmly wheninsorted andfrorn which, whendesired, thetools can quickly be removed.

The invention will be fully understood from the following descriptiontaken in connection, with the accompanyin drawings, and the novelfeatures thereof W1 l he pointed out and clearly defined in the claimsat the.

close ofthe specification. 1

In the drawings,.-Figure 1 is a front elevation of a tool-holder used inconnection with surfacerbush-chisels run by power and with tools fittedtherein. Fig; 2 is a side elevationat righta-ngles with Fig. 1 Fig. 3 isa side elevation of the tool-holder,the shank being partially brokenaway and the chisels removed. Fig. 4 is a front elevation partly insection of the tool-holder without the tools. Fig. 5 is a bottomend.view of the holder.

[Fig (i is-a Fig. 4. strengthen the holder by forming a'rigid' con'nection between the two arms and thereby chisels.

Referring to the draw1ngs,1 represents the stock or shank of the holderof a surface!" bush-chisel and 2 the head which is bifurcated at theouter end forming two jaws or checks 3, 3,. between which the chisels'orother work tools are to be held. This head is preferably formed with itstwo opposite exterior sides 21 flat and parallel with each other andwith the front and rear faces 22 convex as clearly shown in thedrawings. The inner faces 4, 4, of the arms 3, 3, are tapered upwardly.

Extending downwardly from the, head midway of its width and bridging thespace between the two jaws 3, 3, and joining them or formed integraltherewith is a tongue '5 which extends for some distance toward thelower endof thejaws, the length of the tongue preferably extendingsomewhat more than half the distance from the base of the openingbetweenthe jaws to the ends thereof. wardly tapering sides as clearlyshown in This tongue serves both to not only strengthens but stiil'ensthe same; it also serves a lock for the chisels and prevents side motionthereof. The two out side chisels 6', 6,01 the group are rorniedwith theouter sides 6 of their shanks tapered to correspond with the taperedsides t, 4, of the jaws of the holder. The inner faces of the outsidetools 6, 6, are straight. The inter mediate tools 7 which'include all ofthe tools between the two outside tools are formed with parallel faces.

The tools 6, 7 are all formed with a tapered slot 8 in the base endsthereof corresponding with the tapered tongue 5 of the holder, the depthof the slots being equal to the length of the tongue so that when thetools-are inserted in the head they will all fit over the tongue 5, thebutt ends of the tools whendriven home resting square against the bottomend'9 of the head so as to form a rigid stop for the toolsand to avoidany excessive tightening. They may be made .to fit so snuglythat whenfirst inserted in the holder by hand they will bind upon the sides ofthe hea'd sufficiently to hold them in place before being driven clearback honie and at the first blow of the tool after they are put inoperation they will be driven home with the perspective view of one ofthe- Thistongue is made ,with down-..

butt ends of the tools solid against the end of the head. ,51 ,,j Luau iIn order to prepare the tool for working,

.the operator places the tools in position in and then when thepneumatic ower strikes the top of the shank and the en s of the toolsstrike upon the stone at the first blow when in operation, the shankswill be driven en- 1 tirely home with the butt ends of the shanks solidagainst the head.

In order to enable the tools to be released from the holder they aremade somwhat wider than the head, as shown in Fig. 1, each toolprojecting a slight distance on both sides of the head. In order torelease the work tools the holder is to be placed bottom up between twosupports with the projecting rear ends of the tools resting on thesupports while the holder hangs free between the supports. By a simpleblow from a hammer u on the ends 10 of the jaws of the holder, t eholder will be released from the tools. Preferably, the angle oftaper'of the inner face 4 of the jaws should be the same as the angle oftaper of the tongue 5 and slot 8.

claim as my invention:

1. A tool holder having a bifurcated head formed with two downwardlyextending cheeks or jaws whose inner faces are flat and flaredownwardly, a tongue which projects downward from the bottom of thethroat between the jaws and bridges the throat between them intermediatetheir sides, in com bination with a plurality of working tools havingshanks which are formed with a ta pered slot corresponding in shape anddepth I to the tongue on the holder, whereby the work tools may bewedged onto the tongue with their butt ends bearing against the solidend of the head, the outer faces of the two outside tools being taperedto correspond with the tapered faces of the jaws,

the groups of tools filling the space between the jaws.

I 2. A tool holder having a bifurcated head j formed with two downwardlyextending i cheeks or jaws whose inner faces are fiat and l flaredownwardly, a tongue which projects 1 downward from the bottom of thethroat 1 between the jaws, and of somewhat less length than the jaws,and bridges the throat .5 between them intermediate their sides, incombination with a plurality of working tools having shanks which areformed with a tapered slot corresponding in shape and depth to thetongue on the holder, whereby the work tools may be wedged onto thetongue with their butt ends bearing against l the solid end of the head,the outer faces of the two outside tools being tapered to correspondwith the tapered faces of the jaws,

the jaws. 1

37 A tool holder having a bifurcated head formed with two downwardlyextending cheeks or jaws whose inner faces are flat and flaredownwardly, a tongue which. projects downward from the bottom of thethroat between theaws and bridges the throat between them intermediatetheir sides, in combination with a plurality of working tools havingshanks which are formed with a ta pered slot corresponding in shape anddepth to the tongue on the holder, whereby the work tools may be wedgedonto the tongue with their butt ends bearing against the solid end ofthe head, the outer faces of the two outside tools being tapered tocorrespend with the tapered faces of the jaws, the groups of toolsfilling the space between the jaws, the shanks or the tools being ofgreater width than the width of the jaws.

In testimony whereofI aflix my signature in presence of two witnesses.

ENOS S. COSTA. Witnesses:

Amos H. Mona son, ALINE'TARR i the group of tools filling the spacebetween

